Finished Prophecies & EOTN, Factions or Nightfall next? + Mission Bonus questions...

[fldash]

I finished Hell's Precipice last night on my Prophecies character and had already completed EOTN. I already have a quite a few heroes, because I did some quests in Nightfall (up to 'And a Hero Shall Lead Them' to get them. So I'm basically wondering which I should try to tackle first. I wanted to get the hard part (Prophecies) out of the way (and I did).

I still have 4/5 bonus missions in Prophecies to do, but considering leaving them for now and coming back if necessary. The ones I have are:

Dunes of Despair: Somehow defeat 3 generals while protecting the ghost.
Dragon's Lair: Kill Glint
Abbadon's Mouth: Escort that crazy lady Leah that runs ahead of everyone and gets killed.
Hell's Precipice : Protect that Seer then kill the Lords.

I think I understand how to do Dunes of Despair which is to just stay with the Hero until the boss comes from the West game, then quickly kill him and run south to destroy the generals.

Glints should be no problem.

Abbadon's Mouth... I think I'm going to completely clear the way for her before talking to her because she is just ridiculous.

Hell's Precipice... I'm not sure. I tried to get the bonus 5-6 times before eventually just saying screw it and completing the mission. Every time the seer died. If I tried to run to protect him, my heroes died... There are like 3 Sparks that are just North of him that are the issue...

Any advice on Dunes of Despair, Abbadon's Mouth, or Hell's Precipice bonuses?